explaining. biology on Instagram: "The early development of the heart is a rapid and highly complex process that begins in the third week of gestation. During this phase, the heart evolves from a simple tubular structure into a fully developed four-chambered organ by the eighth week. This development is critically important, as the heart is the first functional organ to form, ensuring the continuous supply of oxygen and essential nutrients to the rapidly growing embryo. 📩 DM for credit or remov